YOU SAID:

my cat just had kittens, yes those small cats are my cat's children.

INTO JAPANESE

私の猫には子猫がいました。そうです、それらの小さな猫は私の猫の子供です。

BACK INTO ENGLISH

My cat had a kitten. Yes, those little cats are children of my cat.

INTO JAPANESE

私の猫には子猫がいました。はい、それらの小さな猫は私の猫の子供です。

BACK INTO ENGLISH

My cat had a kitten. Yes, those little cats are children of my cat.